Broken balance

Hello, thank you for posting,

It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. 

You will need to measure the length of the metal channel excluding the nylon attachments and review the metal channel for a number stamp that will indicate the spring strength option needed.

If there is no number present, you will need to obtain the weight of the window sash and compare the strength chart on the product page. Please review and let me know if you have any additional questions! 

Comparison of the S351 and S390 balance shoes.